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Ask a Quizmaster (cont'd)

Is the thing about a comma before "and" in a list, such as
helium, neon, and argon
not
helium, neon and argon

a little pedantic if you don't mind me asking? I've had quizzes returned JUST for that and is it really worth waiting 2 months to have it returned for something nbody will even notice? It's not a major grammar error or anythingChemistry is awesome!